Shear Wave Anisotropy
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Acoustic Birefringence and Poisson's Ratio Determined by Ultrasound: Tools to Follow-Up Deformation by Cold Rolling and Recrystallization
Poisson's ratio and birefringence, both measured by ultrasound, are used to follow the evolution of the anisotropy in ASTM A-36 steel plates cold-rolled between 5 and 50% deformation, and then subjected to recrystallization at 900 and 1000 ºC. Times of flight of longitudinal and shear waves along the thickness of the plates were measured. As orthotropy incr
Mat. Res.. Publicado em: 31/07/2017
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2. Propriedades sísmicas anisotrópicas derivadas da orientação cristalográfica preferencial de muscovita-quartzo milonitos
Seismic wave propagation in organized matter usually results in azimuthal variations of longitudinal waves (Pwaves), as well as the effect of birefringence in transversal waves (S-waves), which results in two orthogonal shear waves with contrasting velocities. In this paper we present the results of the anisotropic seismic properties of five samples of musco
Publicado em: 2010
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3. Anisotropia sísmica crustal na região de Cascavel - CE
This dissertation presents a study on crustal seismic anisotropy in Cascavel - CE. The earthquake data employed here are from the Seismological Laboratory at Universidade Federal do Rio Grande do Norte (UFRN) and were colected from 29 September 1997 to 05 march 1998 using six three-component digital seismographic stations. In general, the cause of the observ
Publicado em: 2007
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4. Estudo sísmico no açude Tucunduba, Senador Sá, CE
The Tucunduba Dam, is west of Fortaleza, Ceará State. The seismic monitoring of the area, with an analogical station and seven digital stations, had beginning on June 11, 1997. The digital stations, operated from June to November 1997. The data collected in the period of digital monitoring was analyzed for determination of hypocenters, focal mechanisms, and
Publicado em: 1999
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5. Modelagem e inversão de coeficientes de reflexão em meios fraturados usando algoritmo genetico
We present a method for the exact modeling and inversion of multi-azimutal qP-wave reflection coefficients at an interface separating two anisotropic media with at least one of its planes of symmetry paralIel to the interface, Le., monoclinic or higher symmetries. To illustrate the procedure, we compute qP-wave reflection coefficients at an interface separat
Publicado em: 1998
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6. Shear waves in the diamond-anvil cell reveal pressure-induced instability in (Mg,Fe)O
The emerging picture of Earth's deep interior from seismic tomography indicates more complexity than previously thought. The presence of lateral anisotropy and heterogeneity in Earth's mantle highlights the need for fully anisotropic elasticity data from mineral physics. A breakthrough in high-frequency (gigahertz) ultrasound has resulted in transmission of
National Academy of Sciences.